Acadia National Park Managers’ Report
From citizen science observations
21 July 2025 - 27 July 2025

Introduction

Welcome to the weekly report of iNaturalist and eBird records. These are all observations submitted during the last week for species that Acadia National Park managers have identified as being of management interest.

These data for this report comes from two of the largest open source citizen science projects: iNaturalist and eBird. The records here are both casual and research grade observations, so erroneous identifications are possible.

Pest & Invasive Species

A Hemlock tree infested with Hemlock Woolly Adelgid
© Jesse Wheeler
scientific.name common.name observed.on link
Frangula alnus alder buckthorn 2025-07-25 view observation
Galeopsis bifida bifid hemp-nettle 2025-07-24 view observation
Solanum dulcamara bittersweet nightshade 2025-07-22 view observation
Solanum dulcamara bittersweet nightshade 2025-07-22 view observation
Solanum dulcamara bittersweet nightshade 2025-07-25 view observation
Solanum dulcamara bittersweet nightshade 2025-07-26 view observation
Solanum dulcamara bittersweet nightshade 2025-07-27 view observation
Epipactis helleborine broad-leaved helleborine 2025-07-23 view observation
Epipactis helleborine broad-leaved helleborine 2025-07-23 view observation
Cirsium vulgare bull thistle 2025-07-25 view observation
Calluna vulgaris common heather 2025-07-27 view observation
Berberis thunbergii japanese barberry 2025-07-23 view observation
Rosa rugosa rugosa rose 2025-07-21 view observation
Rosa rugosa rugosa rose 2025-07-23 view observation
Rosa rugosa rugosa rose 2025-07-27 view observation
Centaurea stoebe spotted knapweed 2025-07-21 view observation

Threatened & Endangered Species

Two Red Knots in flight
© Fyn Kynd
scientific.name common.name listing.status observed.on link
Sterna paradisaea arctic tern state threatened 2025-07-21 view observation
Fratercula arctica atlantic puffin state threatened 2025-07-21 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-21 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-22 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-23 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-23 view observation
Alca torda razorbill state threatened 2025-07-21 view observation

Rare Species

A flowering Nodding Trillium
© Andy Fyon
scientific.name common.name observed.on link
Typha latifolia broadleaf cattail 2025-07-23 view observation
Asclepias syriaca common milkweed 2025-07-21 view observation
Asclepias syriaca common milkweed 2025-07-27 view observation
Tsuga canadensis eastern hemlock 2025-07-24 view observation
Toxicodendron radicans eastern poison ivy 2025-07-27 view observation
Diphasiastrum digitatum fan clubmoss 2025-07-23 view observation
Mollugo verticillata green carpetweed 2025-07-23 view observation
Lycopodiella inundata inundated bog clubmoss 2025-07-23 view observation
Danaus plexippus monarch 2025-07-25 view observation
Cypripedium acaule pink lady’s slipper 2025-07-21 view observation
Cypripedium acaule pink lady’s slipper 2025-07-25 view observation
Lilium philadelphicum wood lily 2025-07-23 view observation
Lilium philadelphicum wood lily 2025-07-23 view observation
Lilium philadelphicum wood lily 2025-07-23 view observation
Bombus terricola yellow-banded bumble bee 2025-07-22 view observation

New Park Species

A something
© Kyle Lima

There were no new species to the park reported this week.

Download Full Datasets

Schoodic Institute at Acadia National Park logo

Our mission is inspiring science, learning, and community for a changing world.

This project was made possible in part by a grant from the National Park Foundation.

Background art of Acadia National Park © Ben Tero.

© 2025 Schoodic Institute at Acadia National Park

Data Citations:
iNaturalist. Available from https://www.inaturalist.org. Accessed [2025-07-28].

eBird. eBird: An online database of bird distribution and abundance [web application]. eBird, Cornell Lab of Ornithology, Ithaca, New York. Available: http://www.ebird.org. (Accessed: Date [ 2025-07-28 ]).

GBIF.org (14 February 2023) GBIF Occurrence Download https://doi.org/10.15468/dl.pqwpft

GBIF.org (14 February 2023) GBIF Occurrence Download https://doi.org/10.15468/dl.hhz84h

Michonneau F, Collins M, Chamberlain SA (2025). ridigbio: An interface to iDigBio’s search API that allows downloading specimen records. R package https://github.com/iDigBio/ridigbio

SCAN. 2023. http//:scan-bugs.org/portal/index.php. Accessed on February 14.